523255731391 has 2 divisors, whose sum is σ = 523255731392. Its totient is φ = 523255731390.

The previous prime is 523255731389. The next prime is 523255731421. The reversal of 523255731391 is 193137552325.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 523255731391 - 2¹ = 523255731389 is a prime.

Together with 523255731389, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (523255738391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 261627865695 + 261627865696.

It is an arithmetic number, because the mean of its divisors is an integer number (261627865696).

Almost surely, 2^523255731391 is an apocalyptic number.

523255731391 is a deficient number, since it is larger than the sum of its proper divisors (1).

523255731391 is an equidigital number, since it uses as much as digits as its factorization.

523255731391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 850500, while the sum is 46.

The spelling of 523255731391 in words is "five hundred twenty-three billion, two hundred fifty-five million, seven hundred thirty-one thousand, three hundred ninety-one".